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#Post#: 3271--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 4, 2020, 5:33 am
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Hehehe! Cheers!
My modelling interests are almost entirely nautical- steam
launches, flash steam plants, tethered hydroplanes and Edwardian
style straight running. I inherited a rather incredible
collection of marine steam engines and boilers some years ago,
which somewhat catapulted me into the fascinating world of model
engineering. Oh and a little bit of free sailing 36rater pond
yachts. I miss pond days. The club I belong to hasn’t really had
the chance to do much this year. :c(
I got my springs from Ghostbikes- if you ring them up, ask for
Sarah. I bought the last set of 36kilo springs they had, but
they’ve got some 37s left-
HTML https://www.ghostbikes.com/3057-junior-pro-jump-f-series-f30-black-springs-(pair).html
The ones I got are child size springs. Some of the adult ones
are longer and possibly straighter, but might not be available
in the lower weights which appears to be wot we need.
If you can find some 30kilo springs I’d imagine they’d probably
be the best.
#Post#: 3272--------------------------------------------------
Re: Riley Special chassis
By: Adrian Date: December 4, 2020, 6:21 am
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Many thanks for the info on the springs.
I have bought some (37kgs was all they had) just to see what
they are like. They cost me £37 for a pair and if they are OK
then the spring issue is sorted!
#Post#: 3275--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 4, 2020, 8:52 am
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Cool! I’ve had some ideas about adding eyes to the ends,
involving a little bit of welding up a bracket sort of thing.the
mounting holes that are already there are 5mm in diameter, but a
glass drillbit seems perfectly happy taking them out to 6mm or
wider.
#Post#: 3276--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 4, 2020, 11:59 am
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Today’s lunchtime fun involved a hecking load of glue, and a lot
of very very fast screwing things together before it dried. I
got both sides to this level of completeness, With the rails
mostly boxed apart from outer skin, and glued to the tub sides,
so tomorrow/Sunday I get to finish sanding everything level and
glue on the outside chassis skin.
#Post#: 3282--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 5, 2020, 2:06 pm
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Ive ordered a front axle from Geminikarts, so that will
hopefully turn up soon.
I need to work out steering, and pedals, and suspension mounts
and stuff. Ive got a vague plan as to where everything goes and
how to mount it all to the chassis, but the arrival of the axle
will help solidify those vague ideas.
Its also the single most expensive part of the whole vehicle, as
far as i can tell, so i should probably get round to telling mrs
synthpunk about the race car hiding in the shed.....
My bathroom scales have continued to prove their worth- all the
bits so far still weigh just under 20kg. i reckon im on target
for a finished chassis and bodywork to come in at 30kg or less.
40 for the engine and back axle bits say, 10 for wheels, another
ten for assorted steering and braking gubbins and so maybe 90
kilos total for the whole thing? Certainly less than 100 seems
achievable. Im six foot three but i only weigh 80 kilos after a
good dinner.
#Post#: 3308--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 10, 2020, 8:19 am
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Quick update- seat base frame complete, and a quick test weave-
corners are laminated, the runners and stretchers are about 30mm
dia, and there’s a layer of soft and a layer of dense foam
inside the weave.
It’s a bit of a brainmelter to look at the weave pattern too
closely- sort of reminds me of a Bridget Riley print... so
that’s the world of modern art and vintage cars seamlessly woven
into a dreadful pun that you can sit on... ;c)
#Post#: 3357--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 20, 2020, 3:32 pm
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Ive been a bit concerned about problems with water ingress and
rot, so today has seen the application of 2coats of cuprinol
wood preserver throughout the whole structure, inside and out,
worked well into the grain with a brush. It would be annoying if
the chassis turned to molten weetabix due to mold whilst sitting
in the garage. Its really damp up on the farm over winter, but i
cant have it living in the front room forever so i figured a
helping hand might be in order.
#Post#: 3369--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 24, 2020, 4:04 pm
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Well its nearly christmas and ive still not finished tinkering
in the shed.
Most excitingly i had a couple of very enjoyable conversations
with Rhys over the last few days which has sorted loads of
things out design and theory wise, or at least got me going in
the right direction.
Ive also bought a pair of US buggy springs off him, as ive
decided that designing and building a cyclekart for the first
time as well as experimeting with some unproven method of doing
something fudamental like suspension when maybe i dont have the
basics down yet is asking to get hurt. Luckily the c/f and buggy
springs both match in eye to eye measurement, but with a
different, less extreme arch on the buggy spring. one would work
as under axle and one as over. So thats nice. I can make it
work, and then play around with Science later.
Ive got both rails complete, and skinned, and filled with
expanding foam in the cavities. Ive also decided to raise the
seat by an inch and make the lower floor another torsion box
structure. As it was, it was a bit floppy in the middle due to
only being 6mm at its thinnest. I may also look at moving the
seat (And scuttle, and generally everything in the middle)
forward by 3 inches. And then maybe either shorten the wheelbase
to closer to CK spec and have the engine after the axle, or just
leave more space for mid mounting the engine and have it as much
in front of the axle as i can. Im also going to add some width
to the seat with some more plywood on the tub sides in order to
widen the rails at the front, to make up for the change in plan
on how i mount the springs- theyre no longer hanging outside the
rails, so i can make the chassis a bit wider to compensate. Ive
been through about half a dozen schemes for mounting the
springs, and in the end ive decided to go with the simplest
method and just hang them off the rails, rather than try and
directly replicate the Riley scheme. This will work better with
the new springs as well.
Heres a pic of the lattice that makes up the inside of the new
torsion box under the seat. It’ll probably get filled with foam
as well.
Have a merry xmas everyone, Cheers!
Rich
#Post#: 3378--------------------------------------------------
Re: Riley Special chassis
By: synthpunk Date: December 30, 2020, 2:47 pm
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So ive mostly spent the last few days makin a sledge for missus
Synthpunk who would quite like it to snow. Its coming along
rather well, and even im looking forward to giving it a try, but
now ive built it it probably wont snow in Sussex this year...
Anyways, ive also managed to glue up the bits of wood i cut out
for the seat bottom the other day, And added a bit more. Its now
nicely flat- had a bit of a twist before. Also i filled the
voidspace directly under the seat with more expanding foam.
But most excitingly, i Made Something from Metal for a
change.... i attacked some 5mm thick aluminium with the bandsaw
and a flap disc on the angle grinder and so now i have 4
suspension hanging plates for the front horns. i also
experimented with making some m8 threaded spacers as part of the
design on my lathe, which was fun, but took ages. Its been so
long since i turned it on last i spent most of the time getting
distracted by fixing the rusty spots i kept finding, or hunting
where id stashed the tool bits i needed...
Pics->
#Post#: 3379--------------------------------------------------
Re: Riley Special chassis
By: Adrian Date: December 30, 2020, 3:43 pm
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I think that looks very classy and more than a bit Strat
looking.
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